Migrate from // to //@ for UI tests via migration tool

Author: jieyouxu

tests/ui/abi/abi-sysv64-arg-passing.rs

@@ -1,4 +1,4 @@
-// run-pass
+//@ run-pass
 // Checks if the "sysv64" calling convention behaves the same as the
 // "C" calling convention on platforms where both should be the same
 
@@ -24,10 +24,10 @@
 // issue-62350-sysv-neg-reg-counts
 // struct-return
 
-// ignore-android
-// ignore-arm
-// ignore-aarch64
-// ignore-windows
+//@ ignore-android
+//@ ignore-arm
+//@ ignore-aarch64
+//@ ignore-windows
 
 // note: windows is ignored as rust_test_helpers does not have the sysv64 abi on windows
 

tests/ui/abi/abi-sysv64-register-usage.rs

@@ -1,11 +1,11 @@
-// run-pass
+//@ run-pass
 // Checks if the correct registers are being used to pass arguments
 // when the sysv64 ABI is specified.
 
-// ignore-android
-// ignore-arm
-// ignore-aarch64
-// needs-asm-support
+//@ ignore-android
+//@ ignore-arm
+//@ ignore-aarch64
+//@ needs-asm-support
 
 #[cfg(target_arch = "x86_64")]
 pub extern "sysv64" fn all_the_registers(